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प्रश्न
Give one example of a chemical reaction characterised by change in state.
उत्तर
Change in state: The combustion reaction of candle wax (solid) melts initially to produce molten wax (liquid) and then produces carbon dioxide (gas) and water vapour (liquid). So, in this reaction, state of matter gets changed from solid to liquid and gas.
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संबंधित प्रश्न
Balance the given equation:
BaCI2 + H2SO4 
BaSO4 + HCI
Balance the following equation. Also name the product formed.
FeCI2 + CI2 → FeCI3
Write your observation and name the product when An aqueous solution of barium chloride is added to dilute sulphuric acid.
Balance the following equation:
NaHCO3 → Na2CO3 + H2O + CO2
Write the balanced chemical equation of the following reaction. iron + sulphuric acid → ferrous sulphate + hydrogen.
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of salt formed.
The chemical reactions in which heat is liberated are called endothermic reactions.
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
State what is a ‘balanced equation’.
Balance the following simple equation:
NaHCO3 + H2SO4 → Na2SO4 + H2O + CO2
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Write the number of atoms of various elements in the reactants and products.
